United Federation of Teachers President Mike Mulgrew William Farrington

Plainly Mike Mulgrew doesn’t like competition.

The head of the New York City teachers union just denounced Gov. Cuomo for “trying to destroy education.” Doesn’t everybody know that’s the UFT’s job!?!

Truth is, this city’s union-run school system really cannot be “destroyed” much more than it already has been. Today, just three in five kids graduate in four years from city high schools, and nearly two of the three aren’t ready for college or a job.

What has Mulgrew so steamed are proposals from Gov. Cuomo — lifting the charter cap, a tax credit for scholarships to parochial schools, etc. — that would weaken his union’s iron grip on the schools if passed.

So Mulgrew has declared “war.” On Thursday, he issued a report claiming charters don’t teach enough kids with special needs. So the charter cap should be frozen “unless and until charters meet their obligations to the city’s neediest children.”

Now, this could be taken for a stand-up shtick, given the charter run by Mulgrew’s own union has fewer than half as many special-ed kids, per capita, as its district — and barely a fifth of non-English-speaking kids.

And because the city tends to segregate these kids, hundreds of other traditional public schools have very few special-ed or foreign-speaking students, as a new report by Families for Excellent Schools notes. Why isn’t Mulgrew railing about them?

Still, we take comfort from his alarm. The failure of New York’s public schools can no longer be hidden — and the monopoly’s most powerful protector in Albany, Shelly Silver, is now out as speaker.